In A-3 residential (multiple-family residence district) the only uses which may hereafter be established are:
Any use permitted in the A-1 and A-2 residential districts.
Multiple-family dwelling units.
Single-family detached dwellings.
Townhouses, cluster houses and one- and two-family attached dwellings.
Any one or more of the foregoing uses individually or in combination with one another under a planned unit development. (1983 Code)